Honeywell C7772A - Manual (Page 3)

C7772A, F, G WALLPLATE TEMPERATURE SENSOR
3 68-0213—04
Table 1. C7772 Models.
NOTE: TCR = temperature coefficient of resistance.
Mounting
To mount on conduit box (see Fig. 2):
1. Remove the appropriate knockout on the standard utility
conduit box for the application.
2. Make wiring connections to the system components.
IMPORTANT
Level only for appearance. The sensor functions
normally even when not level.
3. Use the No. 6 screws provided to mount the wallplate to
the conduit box.
Wiring
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect all power supplies before installation.
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can introduce
disruptive electrical interference (noise).
Keep wiring at least one foot away from large inductive
loads such as motors, line starters, lighting ballasts,
and large power distribution panels.
Shielded cable is required in installations where these
guidelines cannot be met.
Ground shield only to grounded controller case.
IMPORTANT
• Temperature sensor wiring can be sized from
16 to 20 AWG depending on the application.
• The maximum length of wire from a device to the
wallplate sensor is 300 ft (91m).
NOTE: Erratic temperature readings from a sensor can be
caused by the wiring practices described below.
These must be avoided to assure proper operation:
1. Do not route temperature sensor wiring with
building power wiring, next to control contactors,
near light dimming circuits, electric motors or
welding equipment.
2. Avoid poor wiring connections.
3. Do not mount sensor in an incorrect environment.
Connect the low voltage wiring from the controller terminals to
the sensor screw terminals and tighten. See Fig. 2.
Fig. 2. Mounting, wiring for C7772.
OPERATION
The C7772 Wallplate Temperature Sensor provides a resistive
output signal proportional to the sensed room temperature.
Model Sensor Type Nominal Resistance
Resistance-Temperature
Curve Type
Lead Wire
Color
C7772A 20K NTC Thermistor 20,000 ohms at 77°F (25°C) Non-linear Negative TCR Green/Blue
C7772F 10K Ohm NTC Type II Thermistor 10,000 ohms @ 77°F (25°C) Non-linear Negative TCR Green/White
C7772G 10K Ohm NTC Type III Thermistor 10,000 ohms @ 77°F (25°C) Non-linear Negative TCR White/White
STANDARD UTILITY
CONDUIT BOX
CONNECTOR
LOCKNUT
AND
CONDUIT
TO APPROPRIATE
SYSTEM
COMPONENTS
BLANK
FACEPLATE
M16296